package com.ruoyi.common.utils.poi;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.apache.poi.hssf.usermodel.DVConstraint;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataValidation;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.ResourceUtils;
import com.ruoyi.framework.aspectj.lang.annotation.Excel;
import com.ruoyi.framework.shiro.web.session.OnlineWebSessionManager;
import com.ruoyi.framework.web.domain.AjaxResult;

/**
 * Excel相关处理
 * 
 * @author flyfish
 */
public class ExcelUtil<T> {

	private static final Logger log = LoggerFactory.getLogger(OnlineWebSessionManager.class);

	public Class<T> clazz;

	public ExcelUtil(Class<T> clazz) {
		this.clazz = clazz;
	}

	public List<T> importExcel(String sheetName, InputStream input) throws Exception {
		List<T> list = new ArrayList<T>();

		Workbook workbook = WorkbookFactory.create(input);
		Sheet sheet = workbook.getSheet(sheetName);
		if (!sheetName.trim().equals("")) {
			sheet = workbook.getSheet(sheetName); // 如果指定sheet名,则取指定sheet中的内容.
		}
		if (sheet == null) {
			sheet = workbook.getSheetAt(0); // 如果传入的sheet名不存在则默认指向第1个sheet.
		}
		int rows = sheet.getPhysicalNumberOfRows();

		if (rows > 0) {
			// 有数据时才处理
			Field[] allFields = clazz.getDeclaredFields(); // 得到类的所有field.
			Map<Integer, Field> fieldsMap = new HashMap<Integer, Field>(); // 定义一个map用于存放列的序号和field.
			for (Field field : allFields) {
				// 将有注解的field存放到map中.
				if (field.isAnnotationPresent(Excel.class)) {
					Excel attr = field.getAnnotation(Excel.class);
					int col = getExcelCol(attr.column());// 获得列号
					field.setAccessible(true);// 设置类的私有字段属性可访问.
					fieldsMap.put(col, field);
				}
			}
			for (int i = 1; i < rows; i++) {
				// 从第2行开始取数据,默认第一行是表头.
				Row row = sheet.getRow(i);
				int cellNum = sheet.getRow(0).getPhysicalNumberOfCells();
				T entity = null;
				for (int j = 0; j < cellNum; j++) {
					Cell cell = row.getCell(j);
					if (cell == null) {
						continue;
					} else {
						// 先设置Cell的类型，然后就可以把纯数字作为String类型读进来了 by zhuyangyong 20171228
						row.getCell(j).setCellType(Cell.CELL_TYPE_STRING);
						cell = row.getCell(j);
					}

					String c = cell.getStringCellValue();
					if (c.equals("")) {
						continue;
					}

					entity = (entity == null ? clazz.newInstance() : entity);// 如果不存在实例则新建.
					Field field = fieldsMap.get(j);// 从map中得到对应列的field.
					// 取得类型,并根据对象类型设置值.
					Class<?> fieldType = field.getType();
					if (String.class == fieldType) {
						field.set(entity, String.valueOf(c));
					} else if ((Integer.TYPE == fieldType) || (Integer.class == fieldType)) {
						field.set(entity, Integer.parseInt(c));
					} else if ((Long.TYPE == fieldType) || (Long.class == fieldType)) {
						field.set(entity, Long.valueOf(c));
					} else if ((Float.TYPE == fieldType) || (Float.class == fieldType)) {
						field.set(entity, Float.valueOf(c));
					} else if ((Short.TYPE == fieldType) || (Short.class == fieldType)) {
						field.set(entity, Short.valueOf(c));
					} else if ((Double.TYPE == fieldType) || (Double.class == fieldType)) {
						field.set(entity, Double.valueOf(c));
					} else if (Character.TYPE == fieldType) {
						if ((c != null) && (c.length() > 0)) {
							field.set(entity, Character.valueOf(c.charAt(0)));
						}
					} else if (java.util.Date.class == fieldType) {
						if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
							SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
							cell.setCellValue(sdf.format(cell.getNumericCellValue()));
							c = sdf.format(cell.getNumericCellValue());
						} else {
							c = cell.getStringCellValue();
						}
					} else if (java.math.BigDecimal.class == fieldType) {
						c = cell.getStringCellValue();
					}
				}
				if (entity != null) {
					list.add(entity);
				}
			}
		}

		return list;
	}

	/**
	 * 对list数据源将其里面的数据导入到excel表单
	 * 
	 * @param sheetName 工作表的名称
	 */
	public AjaxResult exportExcel(List<T> list, String sheetName) {
		Field[] allFields = clazz.getDeclaredFields();// 得到所有定义字段
		List<Field> fields = new ArrayList<Field>();
		// 得到所有field并存放到一个list中.
		for (Field field : allFields) {
			if (field.isAnnotationPresent(Excel.class)) {
				fields.add(field);
			}
		}

		HSSFWorkbook workbook = new HSSFWorkbook();// 产生工作薄对象
		// excel2003中每个sheet中最多有65536行
		int sheetSize = 65536;
		double sheetNo = Math.ceil(list.size() / sheetSize);// 取出一共有多少个sheet.
		for (int index = 0; index <= sheetNo; index++) {
			HSSFSheet sheet = workbook.createSheet();// 产生工作表对象
			if (sheetNo == 0) {
				workbook.setSheetName(index, sheetName);
			} else {
				workbook.setSheetName(index, sheetName + index);// 设置工作表的名称.
			}
			HSSFRow row;
			HSSFCell cell; // 产生单元格

			row = sheet.createRow(0); // 产生一行
			// 写入各个字段的列头名称
			for (int i = 0; i < fields.size(); i++) {
				Field field = fields.get(i);
				Excel attr = field.getAnnotation(Excel.class);
				int col = getExcelCol(attr.column()); // 获得列号
				cell = row.createCell(col); // 创建列
				cell.setCellType(HSSFCell.CELL_TYPE_STRING); // 设置列中写入内容为String类型
				HSSFCellStyle cellStyle = workbook.createCellStyle();
				cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
				cellStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
				if (attr.name().indexOf("注：") >= 0) {
					HSSFFont font = workbook.createFont();
					font.setColor(HSSFFont.COLOR_RED);
					cellStyle.setFont(font);
					cellStyle.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
					sheet.setColumnWidth(i, 6000);
				} else {
					HSSFFont font = workbook.createFont();
					font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); // 粗体显示
					cellStyle.setFont(font); // 选择需要用到的字体格式
					cellStyle.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
					// 设置列宽
					sheet.setColumnWidth(i, 3766);
				}
				cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
				cellStyle.setWrapText(true);
				cell.setCellStyle(cellStyle);

				cell.setCellValue(attr.name());// 写入列名

				// 如果设置了提示信息则鼠标放上去提示.
				if (!attr.prompt().trim().equals("")) {
					setHSSFPrompt(sheet, "", attr.prompt(), 1, 100, col, col); // 这里默认设了2-101列提示.
				}
				// 如果设置了combo属性则本列只能选择不能输入
				if (attr.combo().length > 0) {
					setHSSFValidation(sheet, attr.combo(), 1, 100, col, col); // 这里默认设了2-101列只能选择不能输入.
				}
			}

			int startNo = index * sheetSize;
			int endNo = Math.min(startNo + sheetSize, list.size());
			// 写入各条记录,每条记录对应excel表中的一行
			HSSFCellStyle cs = workbook.createCellStyle();
			cs.setAlignment(HSSFCellStyle.ALIGN_CENTER);
			cs.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
			for (int i = startNo; i < endNo; i++) {
				row = sheet.createRow(i + 1 - startNo);
				T vo = (T) list.get(i); // 得到导出对象.
				for (int j = 0; j < fields.size(); j++) {
					Field field = fields.get(j); // 获得field.
					field.setAccessible(true); // 设置实体类私有属性可访问
					Excel attr = field.getAnnotation(Excel.class);
					try {
						// 根据Excel中设置情况决定是否导出,有些情况需要保持为空,希望用户填写这一列.
						if (attr.isExport()) {
							cell = row.createCell(getExcelCol(attr.column()));// 创建cell
							cell.setCellStyle(cs);
							try {
								if (String.valueOf(field.get(vo)).length() > 10)
									throw new Exception("长度超过10位就不用转数字了");
								// 如果可以转成数字则导出为数字类型
								BigDecimal bc = new BigDecimal(String.valueOf(field.get(vo)));
								cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
								cell.setCellValue(bc.doubleValue());
							} catch (Exception e) {
								cell.setCellType(HSSFCell.CELL_TYPE_STRING);
								if (vo == null) {
									cell.setCellValue(""); // 如果数据存在就填入,不存在填入空格.
								} else {
									cell.setCellValue(field.get(vo) == null ? "" : String.valueOf(field.get(vo)));// 如果数据存在就填入,不存在填入空格.
								}

							}
						}
					} catch (Exception e) {
						log.error("导出Excel失败{}", e);
					}
				}
			}
		}
		try {
			String filename = encodingFilename(sheetName);
			OutputStream out = new FileOutputStream(getfile() + filename);
			workbook.write(out);
			out.close();
			return AjaxResult.success(filename);
		} catch (Exception e) {
			log.error("关闭flush失败{}", e);
			return AjaxResult.error("导出Excel失败，请联系网站管理员！");
		}
	}

	/**
	 * 将EXCEL中A,B,C,D,E列映射成0,1,2,3
	 * 
	 * @param col
	 */
	public static int getExcelCol(String col) {
		col = col.toUpperCase();
		// 从-1开始计算,字母重1开始运算。这种总数下来算数正好相同。
		int count = -1;
		char[] cs = col.toCharArray();
		for (int i = 0; i < cs.length; i++) {
			count += (cs[i] - 64) * Math.pow(26, cs.length - 1 - i);
		}
		return count;
	}

	/**
	 * 设置单元格上提示
	 * 
	 * @param sheet 要设置的sheet.
	 * @param promptTitle 标题
	 * @param promptContent 内容
	 * @param firstRow 开始行
	 * @param endRow 结束行
	 * @param firstCol 开始列
	 * @param endCol 结束列
	 * @return 设置好的sheet.
	 */
	public static HSSFSheet setHSSFPrompt(HSSFSheet sheet, String promptTitle, String promptContent, int firstRow, int endRow, int firstCol, int endCol) {
		// 构造constraint对象
		DVConstraint constraint = DVConstraint.createCustomFormulaConstraint("DD1");
		// 四个参数分别是：起始行、终止行、起始列、终止列
		CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
		// 数据有效性对象
		HSSFDataValidation data_validation_view = new HSSFDataValidation(regions, constraint);
		data_validation_view.createPromptBox(promptTitle, promptContent);
		sheet.addValidationData(data_validation_view);
		return sheet;
	}

	/**
	 * 设置某些列的值只能输入预制的数据,显示下拉框.
	 * 
	 * @param sheet 要设置的sheet.
	 * @param textlist 下拉框显示的内容
	 * @param firstRow 开始行
	 * @param endRow 结束行
	 * @param firstCol 开始列
	 * @param endCol 结束列
	 * @return 设置好的sheet.
	 */
	public static HSSFSheet setHSSFValidation(HSSFSheet sheet, String[] textlist, int firstRow, int endRow, int firstCol, int endCol) {
		// 加载下拉列表内容
		DVConstraint constraint = DVConstraint.createExplicitListConstraint(textlist);
		// 设置数据有效性加载在哪个单元格上,四个参数分别是：起始行、终止行、起始列、终止列
		CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
		// 数据有效性对象
		HSSFDataValidation data_validation_list = new HSSFDataValidation(regions, constraint);
		sheet.addValidationData(data_validation_list);
		return sheet;
	}

	/**
	 * 编码文件名
	 */
	public String encodingFilename(String filename) {
		filename = UUID.randomUUID().toString() + "_" + filename + ".xls";
		return filename;
	}

	public String getfile() throws FileNotFoundException {
		return ResourceUtils.getURL("classpath:").getPath() + "static/file/";
	}

}